J
Jim Thompson
- Jan 1, 1970
- 0
Why yes, I do sometimes. But even at the frequencies used by modern
switchers the skin depth becomes an issue. At 1MHz in copper, it's
about 2.6 mils. For a winding that needs to handle several amps (and
therefore need to use wire with an effective diameter considerably more
than 5 mils), it's worth thinking about. It's not unusual to see Litz
wire being used in such transformers.
Cheers,
Tom
Litz is important even at 20KHz.
After melting a few bobbins I did some calculations and discovered the
source of the heat... the 9th harmonic matters :-(
...Jim Thompson